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Hypopoptoma gulare, also known as Giant Otocinclus, is a small Amazonian catfish from the family Loricariidae. Despite its common name, it is not a true Otocinclus, but a member of the genus Hypoptopoma, recognized by its flattened body and mouth adapted for grazing surfaces. Native to Peru, it comes from the Rio Ucuyali basin and inhabits quiet areas bordered by vegetation. This **wild-collected species** is less common than the small Otocinclus regularly available in the aquarium trade. It is especially appealing to aquarists looking for a discreet loricariid specialized in **biofilm grazing** and suited to a mature aquarium.

General description

Hypopoptoma gulare is a small loricariid belonging to the subfamily Hypoptopomatinae. It is mainly benthic and spends much of its time resting on leaves, roots, glass or hardscape. Its temperament is generally peaceful, making it suitable for a community aquarium containing other calm small fishes. Like several grazing loricariids, it depends on an established environment where microalgae and natural biofilm can develop. It also benefits from shelters created by roots, leaves and broad plants. The species is **uncommon in the aquarium trade**, and availability may vary. Wild specimens should be acclimated carefully, especially after shipping, because they may arrive thin and need accessible food during their first days in captivity.

Geographic origin and biotope

Hypopoptoma gulare is associated with the **Peruvian Amazon basin**, particularly the Rio Ucuyali in Peru. Its natural environment includes shallow areas, quiet margins and places where the current remains moderate. Submerged surfaces such as leaves, stems, roots and wood provide suitable areas for biofilm growth. In this type of habitat, clean, well-oxygenated water with regular circulation is important, although the fish generally seeks calmer areas rather than rapids. In the aquarium, use a layout rich in grazing surfaces, with enough light to encourage controlled biofilm growth. Gentle filtration without stagnant areas helps maintain good water quality while avoiding excessive current.

Precise locality and local name

The aquarium population is associated with the **Rio Ucuyali**, within Peru’s Amazonian drainage system. The common trade name most often used is Giant Otocinclus, an English name referring to its resemblance to Otocinclus and its relatively larger size. This name should not be interpreted as proof that the fish belongs to the genus Otocinclus. In stores and among importers, the scientific name Hypopoptoma gulare remains the most reliable way to distinguish it from other small loricariids with sucker-like mouths. Since this is a **wild-origin fish**, accurate locality information is especially useful for careful acclimation and for avoiding unnecessary mixing of fish from different river systems.

Appearance and physical characteristics

Hypopoptoma gulare has a short, flattened body covered with bony plates, a relatively broad head and a ventral mouth adapted for adhesion to surfaces. Its pectoral and pelvic fins help it stabilize on leaves, wood and stones. The coloration is generally brownish gray to beige, with darker markings that provide camouflage. Its discreet appearance matches its sedentary and cryptic lifestyle. The flattened body shape and specialized mouth are among the most useful features for identification. Adults reach approximately **5 cm**, depending on the individual. As with many sucker-mouth catfishes, its condition should not be judged by appearance alone: a hollow belly may indicate inadequate feeding, while a slightly rounded belly often reflects better condition.

General diet

The diet of Hypopoptoma gulare consists mainly of **biofilm, soft algae and microorganisms** growing on submerged surfaces. In an aquarium, this natural food source is not always sufficient, especially in a new or extremely clean tank. Regularly provide sinking vegetable foods, such as algae-based tablets, along with blanched vegetables like zucchini or cucumber. A small amount of richer food can supplement the diet, but this fish should not be treated as an algae eater able to survive only on deposits found on the glass. Wild specimens may accept prepared foods slowly; feeding after the lights go out can reduce competition. **Monitoring the belly and overall condition** is essential, because underfeeding is a common risk for newly imported grazing loricariids.

Essential data

• River of origin: Rio Ucuyali
• Local name used: Giant Otocinclus
• Origin of the scientific name: Hypoptopoma refers to the genus; gulare refers to the throat or ventral region of the head.
• Etymology of the full name: Hypoptopoma comes from Greek roots associated with a lower position and the eye; gulare comes from the Latin gŭla, meaning throat.
• Common/vernacular names: Giant Otocinclus
• Family: Loricariidae
• Subfamily: Hypoptopomatinae
• Name pronunciation: hy-po-top-oh-ma - goo-LAH-ree
• Discovery: Edward Drinker Cope, 1878
• Maximum adult size: Approximately 5 cm
• Water temperature and pH: Approximately 24 to 28 °C; pH 6.0 to 7.5
• Watercourse appearance and surrounding vegetation: Quiet or moderately flowing areas with leaves, roots, submerged wood and riparian vegetation.
• Typical tankmates: Corydoras agassizi, Otocinclus vestitus, Hyphessobrycon loretoensis
• Temperament and behavior: Peaceful, discreet, mainly benthic and often active on surfaces covered with biofilm.
• Water depth: Shallow areas and quiet margins.
• Sexual dimorphism: Females are usually stockier; distinction can be difficult in juveniles.
• Bottom structure and flow: Bottoms with plant debris, sand or mud, and low to moderate flow.

In your aquarium

To keep Hypopoptoma gulare successfully, use a mature, stable and well-oxygenated aquarium with wood, roots, plants and several resting areas. Because the species is **wild-collected**, gradual acclimation and close attention to feeding are particularly important. Offer vegetable wafers and vegetables in addition to natural biofilm rather than relying only on algae growing on the glass. Peaceful tankmates, clean water and moderate flow will encourage natural behavior. Stable parameters and regular feeding are the two most important factors for keeping this fish in good condition.